Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 4

EASY

JEE Main/Advance

IMPORTANT

Earn 100

An aqueous solution of concentrated hydrobromic acid contains $48 %$ HBr by mass. If the density of the solution is $\frac{1.50 g}{mL}$ , what is its concentration :(Atomic mass of Br=79.90u,H= 1u)

50% studentsanswered this correctly

Important Questions on Some Basic Concepts of Chemistry

EASY

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 5

An antifreeze mixture consists of

40 %

ethylene glycol

(C_{2} H_{6} O_{2})

by weight in aqueous solution. If the density of this solution is

1.05 g / mL

, what is the molar concentration :

EASY

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 7

{XeF}_{6}

fluorinates

I_{2}

to

{IF}_{7}

and liberates Xenon (g).

210 mmol

of

{XeF}_{6}

can yield a maximum of

- mmol

of

{IF}_{7}

:

EASY

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 8

When

100 g

of ethylene polymerises entirely to polyethene, the weight of polyethene formed as per the equation

n (C_{2} H_{4}) \to {(- {CH}_{2} - {CH}_{2} -)}_{n}

is:

HARD

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 9

A

10

gram sample of natural gas containing

{CH}_{4}

and

C_{2} H_{4}

was burnt in excess of oxygen to give

29.0

grams of

{CO}_{2}

and some water. How many grams of water are formed :

HARD

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 10

50 g

of

ZnS

are strongly heated in air to effect partial oxidation and the resultant mass weighed

44 g

. What is the ratio of

ZnO

to

ZnS

in the resultant mixture :(Given Atomic mass of

Zn - 65.40 u, S - 32 u, O - 16 u

)

MEDIUM

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 12

In a gaseous reaction of the type

aA + bB \to cC + dD

, which is wrong :

MEDIUM

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 13

Iodobenzene

(C_{6} H_{5} I)

is prepared from aniline

(C_{6} H_{5} {NH}_{2})

in a two step process as shown below

C_{6} H_{5} {NH}_{2} + {HNO}_{2} + HCl \to C_{6} H_{5} N_{2} Cl + 2 H_{2} O, C_{6} H_{5} {N_{2}}^{+} {Cl}^{-} + KI \to C_{6} H_{5} I + N_{2} + KCl

In an actual preparation

9.30 g

of aniline was converted to

16.32 g

of iodobenzene. The percentage yield of iodobenzene is :

HARD

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 15

The simplest formula of a compound containing

50 %

of element

X

(atomic mass

= 10

) and

50 %

of the element

Y

(atomic mass

= 20

) by weight is :